The Fyreye MKII Rate of Rise heat detector with built in isolator (MKII-AHRI) uses a thermistor arrangement to sense a quick rise in temperature and also a final threshold temperature of 57°C.
The Fyreye fixed heat detector with built in isolator (MKII- AHFI) has a single thermistor arrangement that gives an alarm at a temperature of 57°C, where the MKII-AHFI/ CS90 gives an alarm above 86°C.
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